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ETRA SOM/ETRA Evaluation Kit/Interfaces and Connectors/JTAG

1,822 bytes removed, 13:15, 31 December 2020
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<section begin="History" />
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<section end="History" /><section begin="Body" />
==JTAG interface ==
 
''TBD: sostituire le sezioni con le informazioni sull'uso della periferica e del suo connettore''
''Nell'esempio di seguito c'è la descrizione dell'interfaccia UART/console''
=== Description ===
The JTAG interface available on the Evaluation Kit at the connector ''TBD:JxxxJ11.''.
''JxxJ11'' is a ''TBD:connector-type'' stripline header connector for the RS232 two-wires UART3 port, 2x15x2.54mm and is also used for debug purposes (bootloader and operating system serial console)expansion signlas.
===Signals ===
The following table describes the interface signalson J11 connector:
{| class="wikitable"
! latexfontsize="scriptsize"| Pin#! latexfontsize="scriptsize"| SOM Pin#! latexfontsize="scriptsize"| Pin name! latexfontsize="scriptsize"| Pin function! latexfontsize="scriptsize"| Pin Notes|-|17|J18.62|VDD|VDD|reference voltage|-|19|J18.90|JTMS-SWDIO|JTMS-SWDIO|
|-
|1,2,4,6,,7,8,1021| -J18.98| N.A.JTCK-SWCLK| N.C.JTCK-SWCLK| Not connected
|-
| 323| J1J18.18992| RS232_RXJTDI| Receive lineJTDI
|
|-
| 325| J1J18.18796| RS232_TXJTDO-TRACESWOO| Transmit lineJTDO-TRACESWOO
|
|-
| 927| -J18.94| DGNDNJTRST| GroundNJTRST
|
|}
 
=== Device mapping ===
UART3 is mapped to <code>/dev/ttymxc2</code> device in Linux. The peripheral is used as the default serial console, both for the bootloader and the kernel.
 
=== Device usage ===
 
To connect to the debug serial port:
 
# connect the DB9 adapter bracket to the J22 connector on the SBCX board
# connect a serial cable between DB9 connector and PC COM port through a NULL-modem cable (not provided)
# start your favorite terminal emulator software on PC (eg: PuTTY); communication parameters are: 115200,N,8,1
 
----
[[Category:ETRA]]
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